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#ifndef Patternist_QObjectNodeModel_H
#define Patternist_QObjectNodeModel_H

#include <QSimpleXmlNodeModel>

class QObject;
class PropertyToAtomicValue;

/**
 * @short Delegates QtCore's QObject into Patternist's QAbstractXmlNodeModel.
 * known as pre/post numbering.
 *
 * QObjectXmlModel sets the toggle on QXmlNodeModelIndex to @c true, if it
 * represents a property of the QObject. That is, if the QXmlNodeModelIndex is
 * an attribute.
 *
 * @author Frans Englich <[email protected]>
 */
class QObjectXmlModel : public QSimpleXmlNodeModel
{
  public:
    QObjectXmlModel(QObject *const object, const QXmlNamePool &np);

    QXmlNodeModelIndex root() const;

    virtual QXmlNodeModelIndex::DocumentOrder compareOrder(const QXmlNodeModelIndex &n1, const QXmlNodeModelIndex &n2) const;
    virtual QXmlName name(const QXmlNodeModelIndex &n) const;
    virtual QUrl documentUri(const QXmlNodeModelIndex &n) const;
    virtual QXmlNodeModelIndex::NodeKind kind(const QXmlNodeModelIndex &n) const;
    virtual QXmlNodeModelIndex root(const QXmlNodeModelIndex &n) const;
    virtual QVariant typedValue(const QXmlNodeModelIndex &n) const;
    virtual QVector<QXmlNodeModelIndex> attributes(const QXmlNodeModelIndex&) const;
    virtual QXmlNodeModelIndex nextFromSimpleAxis(SimpleAxis, const QXmlNodeModelIndex&) const;

  private:
    /**
     * The highest three bits are used to signify whether the node index
     * is an artificial node.
     *
     * @short if QXmlNodeModelIndex::additionalData() has the
     * QObjectPropery flag set, then the QXmlNodeModelIndex is an
     * attribute of the QObject element, and the remaining bits form
     * an offset to the QObject property that the QXmlNodeModelIndex
     * refers to.
     *
     */
    enum QObjectNodeType
    {
        IsQObject               = 0,
        QObjectProperty         = 1 << 26,
        MetaObjects             = 2 << 26,
        MetaObject              = 3 << 26,
        MetaObjectClassName     = 4 << 26,
        MetaObjectSuperClass    = 5 << 26,
        QObjectClassName        = 6 << 26
    };

    typedef QVector<const QMetaObject *> AllMetaObjects;
    AllMetaObjects allMetaObjects() const;

    static QObjectNodeType toNodeType(const QXmlNodeModelIndex &n);
    static bool isTypeSupported(QVariant::Type type);
    static inline QObject *asQObject(const QXmlNodeModelIndex &n);
    static inline bool isProperty(const QXmlNodeModelIndex n);
    static inline QMetaProperty toMetaProperty(const QXmlNodeModelIndex &n);
    /**
     * Returns the ancestors of @p n. Does therefore not include
     * @p n.
     */
    inline QXmlNodeModelIndex::List ancestors(const QXmlNodeModelIndex n) const;
    QXmlNodeModelIndex qObjectSibling(const int pos,
                                      const QXmlNodeModelIndex &n) const;
    QXmlNodeModelIndex metaObjectSibling(const int pos,
                                         const QXmlNodeModelIndex &n) const;

    const QUrl              m_baseURI;
    QObject *const          m_root;
    const AllMetaObjects    m_allMetaObjects;
};


#endif